热处理工艺对Al-Mg-Si系合金导热性能的影响

Effects of Heat Treatment on Thermal Conductivity of Al-Mg-Si Aluminum Alloy

研究了热处理工艺对Al-Mg-Si合金导热性能的影响,并从理论上分析了热处理(均匀化、固溶、时效)的作用机理。结果表明,均匀化处理有助于改善合金的显微组织。采用560℃×6h均匀化制度后组织细小均匀,导热性能较好;随着固溶温度的升高,合金材料的导热性能有下降的趋势,在510℃时强度与导热性能达到较佳配合;人工时效后组织中的缺陷得到有效修复,使导热性能加强,使用200℃×6h时效制度较好。

Effects of heat treatment on thermal conductivity of Al-Mg-Si aluminum alloy were approached,and the mechanism of heat treatment,such as homogenization,solid solution,aging treatment,was described. The results indicate that homogenization treatment is beneficial for improving the microstructure of the alloy. The fine and uniform structure in the alloy with acceptable thermal conductivity can be observed with homogenizing treatment at 560 ℃ for 6 hours. With solid solution temperature increase,the thermal conductivity of the alloy is decreased,and the alloy with desirable strength and thermal conductivity match can be obtained at 510 ℃ solid solution treatment. The thermal conductivity of the alloy is improved after artificial aging treatment as a result of the elimination of defects in the microstructure,and the desirable thermal conductivity can be presented with artificial aging treatment at 200 ℃ for 6 hours.